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Articles by String getName

Spring Data JPA Projections

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By String getName, TeamInfo getTeam, Return Projections.Stream, Integer getAge
| velog.io
Projections란 무엇인가 Projections는 엔티티 전체가 아닌 필요한 필드만 선택적으로 조회하는 기능입니다. JPA를 사용하면 기본적으로 엔티티 전체를 조회하게 됩니다. 하지만 실제 비즈니스 로직에서는 엔티티의 모든 필드가 필요하지 않은 경우가 많습니다. 특히 API 응답이나 화면 표시를 위해 일부 필드만 필요한 경우가 대부분입니다. 엔티티 전체를 조회하면 불필요한 데이터까지 메모리에 로드하게 되어 성능 저하가 발생할 수 있습니다. 또한 연관관계가 있는 엔티티의 경우 N+1 문제가 발생하거나 불필요한 조인이 수행될 수 있습니다. Projections를 사용하면 필요한 컬럼만 SELECT하여 데이터베이스에서 애플리케이션으로 전송되는 데이터양을 줄일 수 있습니다.
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Sum Types and Subtypes and Unions

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By String getName, Justin Le
| blog.jle.im
by ♦ Source ♦ Markdown ♦ LaTeX ♦ Posted in Haskell ♦ There’s yet again been a bit of functional programming-adjacent twitter drama recently, but it’s actually sort of touched into some subtleties about sum types that I am asked about (and think about) a lot nowadays.
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Connecting C++ to Python using Boost.Python...

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By String getName
| DEV Community
Many modern C++ applications provide a Python interface because it combines performance (C++) with ease of use (Python). Here’s why this trend has become so popular: ✔ It allows rapid prototyping. ✔ It combines speed (C++) with flexibility (Python). ✔ Python is popular in AI, ML, and scientific computing. ✔ Users can extend software via Python scripting. Boost.Python is a powerful library that enables seamless integration between C++ and Python.
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Do you want your python code to access C/C++ code? use SWIG...

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By String getName, Somenath Mukhopadhyay
| DEV Community
SWIG (Simplifies Wrapper and Interface Generator) is an interface compiler that connects programs written in C and C++ with scripting languages such as Perl, Python, Ruby, and Tcl. It works by taking the declarations found in C/C++ header files and using them to generate the wrapper code that scripting languages need to access the underlying C/C++ code. Using SWIG, you can replace the main() function of a C/C++ program with a scripting interpreter from which you can control the application.
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How to create your logging system using SLF4J

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By String getName, MDCAdapter getMDCAdapter, String Getrequested ApiVersion
| DEV Community
As a software developer, it's not always possible to dive deep into the language you're working with, and sometimes it's difficult to find situations where you need to use advanced or non-trivial features. It's easy to use a magic framework, the hard part is having the necessary knowledge to create it. For this reason, I created the tag #javaunderthehood to gather this content and help other people understand how this magic happens. Feel free to join me with an interesting new topic.
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Java之I/O系统（上 · 重要）

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By String getName, import java.util.Array List, import java.io.File, import java.io.IOException
| 51cto.com
李晨悦LCY 2023-11-28 09:35:57 博主文章分类：Java 文章标签 java I/O系统 数据流 文件传输 文章分类 代码人生 yyds干货盘点 ©著作权归作者所有：来自51CTO博客作者李晨悦LCY的原创作品，请联系作者获取转载授权，否则将追究法律责任 赞 收藏 评论 分享 举报
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面向对象设计原则之开-闭原则_祺稷的博客-CSDN博客

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By String getName, double getPrice
| CSDN
定义 开闭原则（Open Closed Principle, OCP）由勃兰特·梅耶（Bertrand Meyer）提出，他在 1988 年的著作《面向对象软件构造》（Object Oriented Software Construction）中提出：软件实体应当对扩展开放，对修改关闭（Software entities should be open for extension，but closed for modification），这就是开闭原则的经典定义。 这里的软件实体包括以下几个部分： 项目中划分出的模块 类与接口 方法 开闭原则的含义是：当应用的需求改变时，在不修改软件实体的源代码或者二进制代码的前提下，可以扩展模块的功能，使其满足新的需求。 作用 开闭原则是面向对象程序设计的终极目标，它使软件实体拥有一定的适应性和灵活性，但同时具备稳定性和延续性。具体作用如下： .
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Spring事务管理-快速入门-51CTO.COM

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By int getPropagation Behavior, int getTimeout, String getName, Boolean Is ReadOnly
| 51cto.com
先来讲讲脏读 不可重复读 和 幻读。 脏读:我们在并发编程中是很熟悉的，通俗的讲就是你读得数据已经被修改了，已经过时失去意义了。 不可重复读： 同一个事务里面多次读取同一行数据，却返回不同的结果。 幻读：同样一笔查询在整个事务过程中多次执行后，查询所得的结果集不一样。 事务四大特性 ACID 要求事务所包含的全部操作是一个不可分割的整体，如果有一步发生异常，则全部不提交。 A给B转钱，A减和B增这两个操作必须保持一致。 事务会将一部分数据与其他事务隔离，防止脏读等。 事务的结果被写到持久化存储器中。 事务四大隔离级别 隔离级别越高，则性能相对越低，反之亦然。 最低的隔离级别，跟你直译的意思一样：可以读取其它事务未完成的结果。(脏读) 很明显，脏读 不可重复读 和 幻读这三个问题它都有。 大部分数据库采用的默认隔离级别，比上一个隔离级别多了限定：在该事务完成后，才能读取该事务的数据更新后的结果。 它可以避免脏读，但是也有不可重复读取和幻读的问题。 可以保证在整个事务的过程中，对同一笔数据的读取结果是相同的，不管其他事务是否同时在对同一笔数据进行更新，也不管其他事务对同一笔数...
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C++演讲比赛流程管理系统_黑马_GodOuO的博客-CSDN博客

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By String getName, s.setSpeaker Name, Cout Second
| CSDN
任务 （点击此处-下载源代码） 功能 效果图 speechManager.h #pragma once #include <iostream> #include <vector> #include <map> #include <algorithm> #include <deque> #include <functional> #include <numeric> #include <fstream> #include"speaker.h" using namespace std; class SpeechManager { public: vector<int> v1; vector<int> v2; vector<int> vVectory; map<int, Speaker> m_Speaker; int m_Index; map<int, vector<string>> m_Record; bool fileIsEmpty; SpeechManager(); void show_Menu(); void initSpeech(); void...
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Visitor Design Pattern In Java

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By String getName, double getPrice, double getWeight, ShopItemCategory getCategory
| DZone Verified
Today, I am here to discuss another behavioral design pattern called Visitor Design Pattern. The Visitor design pattern lets us separate algorithms from the objects on which they operate. Visitor Design Pattern The Visitor Design Pattern provides a way of separating an algorithm from an object structure on which it operates. A practical result of this separation is the ability to add new operations to existing object structures without modifying the structures.
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